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WO2004037734A2 - Four de chauffe de feuilles de verre - Google Patents

Four de chauffe de feuilles de verre Download PDF

Info

Publication number
WO2004037734A2
WO2004037734A2 PCT/IT2003/000567 IT0300567W WO2004037734A2 WO 2004037734 A2 WO2004037734 A2 WO 2004037734A2 IT 0300567 W IT0300567 W IT 0300567W WO 2004037734 A2 WO2004037734 A2 WO 2004037734A2
Authority
WO
WIPO (PCT)
Prior art keywords
kiln
tubes
roller
plane
rollers
Prior art date
Application number
PCT/IT2003/000567
Other languages
English (en)
Other versions
WO2004037734A3 (fr
Inventor
Stefano Spezzani
Original Assignee
Keraglass Engineering S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Keraglass Engineering S.R.L. filed Critical Keraglass Engineering S.R.L.
Priority to AU2003274704A priority Critical patent/AU2003274704A1/en
Publication of WO2004037734A2 publication Critical patent/WO2004037734A2/fr
Publication of WO2004037734A3 publication Critical patent/WO2004037734A3/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
    • C03B29/04—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way
    • C03B29/06—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way with horizontal displacement of the products
    • C03B29/08—Glass sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
    • C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
    • C03B35/16—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors
    • C03B35/18—Construction of the conveyor rollers ; Materials, coatings or coverings thereof
    • C03B35/183—Construction of the conveyor rollers ; Materials, coatings or coverings thereof specially adapted for thermal adjustment of the rollers, e.g. insulating, heating, cooling thereof

Definitions

  • the invention relates in particular to kilns for heating flat or arced glass sheets, the kiln being provided with a motorized roller plane on which the glass to be heated during its time in the kiln rests and is moved.
  • Background Art In kilns of this type, which reach an internal temperature of about 700°C, heating is generally done by radiation from radiating panels located above and below the roller plane; the market however also offers kilns having convection-type heating.
  • One of the problems in the prior-art kilns is that the glass sheet entering the kiln, which is therefore in contact with the roller plane, heats up very quickly in the contact areas in which it is actually in contact with the rollers and deforms, albeit temporarily.
  • blowers have been used to blow relatively-cool air onto the rollers in the plane in order to lower their temperature; or hot-air blowers are directed onto the upper surface of the sheet to accelerate the heating thereof and therefore to prevent sheet deformation.
  • These solutions have the drawback of causing turbulence internally of the kiln; in a not-irifrequent scenario, in which the sheet splinters in the kiln, the glass fragments or powders generated are moved internally of the kiln by the turbulence and might be deposited between the rollers and the sheets of glass, damaging the surfaces.
  • the kiln When the presence of glass splinters or powders internally of the kiln is detected, the kiln has to be shut-down in order to proceed to cleaning operations.
  • the main aim of the present invention is to provide an improvement to known kilns for elimmating temporary deformations in the glass sheets without creating a turbulent atmosphere in the kiln itself.
  • An advantage of the invention is that it provides improvements which can be applied, without excessive difficulty, to known kilns.
  • a further advantage of the invention is that it considerably improves heating operations, in particular for special sheets or sheets with surface coatings.
  • a further advantage of the invention is that tempered glass sheets can be more safely heated.
  • figure 1 is a schematic longitudinal section of the kiln of the invention
  • figure 2 is a schematic section of the kiln made according to line II-II of figure l
  • figure 3 is an enlarged-scale representation of a detail of figure 1 in relation to a roller and a cooling body thereof.
  • 1 denotes in its entirety a kiln for tempering glass sheets 4, either flat or arced, which comprises a motorized roller plane 2, on which the glass sheets 4 to be heated are moved while inside the kiln.
  • the sheets enter the kiln by an entrance 7 and, after having completed their heating cycle which usually lasts 41 seconds for every millimetre of thickness of the glass, leave the kiln by an exit 8 and are usually sent on to a tempering station.
  • the roller plane is provided with a plurality of motorized rollers 6 which rotate to move the sheets, usually with a forward-and-backward rhythm during the heating process.
  • the rollers as in known kilns, are commanded to roll in both rotation directions.
  • Means for heating of known type are present inside the kiln.
  • the means for heating are schematically represented by blocks 3, arranged above and below the roller plane; the blocks are resistance elements which heat up the kiln by radiation, but could be of any type.
  • the temperature reached by the kiln, and therefore also by the roller plane, is about 680-720°C at full operation.
  • the kiln of the invention comprises one or more cooling elements 5 which, in the illustrated embodiment, comprise a plurality of tubes 5 which are fixed to the inside of the kiln in proximity of the roller plane 2.
  • one of the tubes 5 is fixed in proximity of each of the rollers 6, below and parallel thereto.
  • the cooling elements 5 comprise a pair of tubes; each pair of tubes is fixed to the inside of the kiln in proximity of a relative roller 6, below and parallel thereto.
  • the tubes can be made, for example, of silicon, a ceramic material or steel; they can be smooth or finned to improve their heat exchanging properties.
  • each of the tubes 5 exhibits a diameter which is equal to or preferably slightly smaller that the radius of the relative roller 6 of the roller plane 2 to which the tube is associated.
  • the tube is arranged with an axis thereof displaced with respect to the axis of the relative roller, so as to be completely positioned in one only half-space defined by a median plane of the relative roller which plane is perpendicular to the lie plane of the roller plane 2.
  • each of the pairs of tubes 5 exhibits an overall diameter which is equal to or preferably shghtly smaller than the radius of the relative roller 6 of the roller plane 2 to which the pair of tubes is associated.
  • the pair of tubes is displaced with respect to the axis of the relative roller, so that it is completely positioned in one only of the half-spaces defined by a median plane of the relative roller which plane is perpendicular to the lie plane of the roller plane 2.
  • the external surface of the cooling elements 5, and in particular of the tubes and the pairs of tubes, is brought, on command to a considerably lower temperature than the internal temperature of the kiln; for this purpose means for cooling are provided which lower, on command, the temperature of the external surface of the cooling elements, up until the temperature is variable between 200 and 300°C.
  • the means for cooling comprise a cool fluid (with respect to the temperature of the kiln), preferably air at a temperature of about 40°C (i.e. cold with respect to the temperature of the kiln), which is blown and made to flow internally of each of the tubes 5 in a predetermined flow direction.
  • the cool air is preferably blown internally of the tubes in order that the blower is not crossed by hot air, as might occur when using an aspiration device taking air from the tubes.
  • a preheating device is provided to bring the air to be introduced into the tubes from ambient temperature to the desired temperature (for example, 40°C).
  • the cold air which is heated through the tubes can advantageously be recycled by means for recycling, of known type, which take the fluid exiting from the tubes, for example in a zone before the entrance 7 of the kiln, or in any other zone of the kiln in which the hot air is useful.
  • the surface temperature of the rollers 6 is maintained, at least during the introduction stage of the sheet and the first stage of the heating process, at a lower temperature with respect to the kiln temperature.
  • the tubes, or pairs of tubes can also be grouped in various sections, each of which sections concerns a particular zone of the roller plane 2; thus , by varying some parameters, such as for example the temperature, the flow rate, the input times for the cold air, or the geometry of the various groups, the temperature of the rollers can be modulated differently in the different sections of the roller plane.
  • the device of the invention enables regulation of the temperature of the rollers in the kiln according to the various working needs.
  • All of the operative modalities can be regulated by programs, through which the desired parameters can be set, such as roller temperature, air ingress time, the temperature and velocity of the air being introduced in the tubes, the temperatures of the upper and lower parts of the kiln, the different treatments, if any, for the various parts of the kiln.
  • An important aspect of the invention is that the roller temperature regulation is obtained with no input of air into the kiln itself, avoiding any turbulence therein.
  • Other advantages offered by the present invention, beyond those already mentioned, are: the possibility, should an unexpected shut-down of the sheet- moving machinery occur, of cooling the tubes to stop the sheets from sticking to the rollers, and the possibility of reducing kiln cooling times should it be necessary to stop the kiln production cycle.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Tunnel Furnaces (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

L'invention porte sur un four à verre (1) présentant un plan (2) de rouleaux motorisés sur lequel reposent les feuilles (4) de verre présentes dans le four (1). Ledit plan (6) chauffé par des moyens (3) ad hoc comporte en outre des tubes (5) ou paires de tubes disposés à proximité de sa surface. La température de la surface extérieure des tubes peut être amenée par une circulation d'air dans les tubes à une température considérablement plus basse que celle du four, pour réguler la température des rouleaux (6).
PCT/IT2003/000567 2002-10-28 2003-09-23 Four de chauffe de feuilles de verre WO2004037734A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003274704A AU2003274704A1 (en) 2002-10-28 2003-09-23 A kiln for heating sheets of glass

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000311A ITMO20020311A1 (it) 2002-10-28 2002-10-28 Forno perfezionato per il riscaldamento di lastre di vetro.
ITMO2002A000311 2002-10-28

Publications (2)

Publication Number Publication Date
WO2004037734A2 true WO2004037734A2 (fr) 2004-05-06
WO2004037734A3 WO2004037734A3 (fr) 2008-01-17

Family

ID=27677245

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2003/000567 WO2004037734A2 (fr) 2002-10-28 2003-09-23 Four de chauffe de feuilles de verre

Country Status (3)

Country Link
AU (1) AU2003274704A1 (fr)
IT (1) ITMO20020311A1 (fr)
WO (1) WO2004037734A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130025324A1 (en) * 2011-07-25 2013-01-31 Keraglass Engineering S.R.L. Kiln for annealing glass slabs

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107162435A (zh) * 2017-05-22 2017-09-15 成都扬中新能源科技有限公司 用于制备电热膜管的加热窑

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB958583A (en) * 1959-10-05 1964-05-21 Indugas Ges Fur Ind Gasverwend Improvements in or relating to cooled conveyor rollers for industrial furnaces
US4303437A (en) * 1979-05-16 1981-12-01 Stein Surface Process for the adjustment of the glass temperature in a float glass lehr and float glass lehr in order to bring this process into operation
US6282923B1 (en) * 1996-05-22 2001-09-04 Uniglass Engineering Oy Heating glass sheets in tempering furnace

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB958583A (en) * 1959-10-05 1964-05-21 Indugas Ges Fur Ind Gasverwend Improvements in or relating to cooled conveyor rollers for industrial furnaces
US4303437A (en) * 1979-05-16 1981-12-01 Stein Surface Process for the adjustment of the glass temperature in a float glass lehr and float glass lehr in order to bring this process into operation
US6282923B1 (en) * 1996-05-22 2001-09-04 Uniglass Engineering Oy Heating glass sheets in tempering furnace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130025324A1 (en) * 2011-07-25 2013-01-31 Keraglass Engineering S.R.L. Kiln for annealing glass slabs
US9499429B2 (en) * 2011-07-25 2016-11-22 Keraglass Industries S.R.L. Kiln for annealing glass slabs
RU2605857C2 (ru) * 2011-07-25 2016-12-27 Керагласс Индастриз С.Р.Л. Печь для обжига стеклянных блоков

Also Published As

Publication number Publication date
ITMO20020311A0 (it) 2002-10-28
WO2004037734A3 (fr) 2008-01-17
ITMO20020311A1 (it) 2004-04-29
AU2003274704A8 (en) 2008-03-13
AU2003274704A1 (en) 2004-05-13

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